2 Requirements

2.1 Software Requirements

The following tools and libraries are required in order to build and run the CCSM3.0 model:

• Compilers: Fortran 90, C
• Tools: gunzip, gmake, Perl5 or higher
• Libraries: MPI, netCDF

The above compilers, libraries and tools do not accompany this release. It is the user's responsibility to download them, install them, and if necessary modify their search path to include them.

2.2 Supported Machines

The following machines and corresponding platforms are supported at one of three different support levels in CCSM3.0 (denoted by RL).

• RL=1 corresponds to machines where climate validations have been performed.
• RL=2 corresponds to machines that have passed the CCSM restart test for the fully active component set (see 7).
• RL=3 corresponds to machines where the CCSM has been built successfully but where the resulting model may or may not have been run successfully, and where if the model ran, restart validation may or may not have been successful.
• RL=4 implies that this machine may be supported sometime in the future.

Table 3: CCSM3 Supported Machines/Platforms

Machine	Description	OS	Compiler	Network	Queue Software	RL
bluesky	IBM Pow4 8-way	AIX	IBM XL	IBM	Load Leveler	1
bluesky32	IBM Pow4 32-way	AIX	IBM XL	IBM	Load Leveler	1
blackforest	IBM Pow3 4-way	AIX	IBM XL	IBM	Load Leveler	1
cheetah	IBM Pow4 8-way	AIX	IBM XL	IBM	Load Leveler	1
cheetah32	IBM Pow4 32-way	AIX	IBM XL	IBM	Load Leveler	1
seaborg	IBM Pow3 16-way	AIX	IBM XL	IBM	Load Leveler	1
chinook	SGI	IRIX64	MIPS	NumaLink	NQS	2
jazz	Intel Xeon	Linux	PGI	Myrinet	PBS	2
anchorage	Intel Xeon	Linux	PGI	Gbit Ethernet	SPBS	3
bangkok	Intel Xeon	Linux	PGI	Gbit Ethernet	SPBS	3
lemieux	Alpha	OSF1	Compaq	Myrinet	PBS	3
moon	NEC Earth Sim	NEC	NEC	NEC	PBS	3
phoenix	Cray X1	Unicos/mp	Cray	CrayLink	PBS	4
calgory	Intel Xeon	Linux	PGI	InfiniBand	SPBS	4
rex	AMD Opteron	Linux	PGI	Myrinet	PBS	4
lightning	AMD Opteron	Linux	PGI	Myrinet	LSF	4

2.3 Memory, disk space and simulation time limitations

Users have numerous options for customizing the CCSM3.0 to suit their own research interests: various combinations of active, data, and dead components, seven possible resolutions, and multiple combinations of platforms, compilers, and operating systems. This flexibility provides obvious benefits to researchers, but also presents a challenge when trying to quantify requirements such as memory, disk space, and simulation times.

For this reason, detailed documentation of such requirements is beyond the scope of this document. In the future, we plan to provide detailed requirements information from the CCSM web page. Until then, the following summary of the requirements from a typical T42_gx1v3 CCSM3.0 model run at NCAR on the IBM machine "bluesky" may provide the user with a general idea of model requirements:

• Run Length: one model year
• Resolution: T42_gx1v3
• History-File Volume: 6.5 Gbytes/model year
• Restart-File Volume: 0.9 Gbytes/model year
• Total CPUs: 104
• Simulation Years/Day: 7.5
• GAUs/Simulation Year: 85, regular queue

2.4 NCAR specific considerations

Supercomputing at NCAR has undergone significant changes since the last release of the CCSM. This section will summarize some of those changes. For the most up-to-date information, visit the following web site (gatekeeper password required):

www.scd.ucar.edu/docs/access/internal/security.html

2.4.1 Roy and the firewall

NCAR's supercomputers are now located behind a firewall. To login, it is necessary to first logon to roy.scd.ucar.edu using the gatekeeper password, and a one-time password generated by the user's CRYPTOCard. After logging in, a prompt will appear. The user must then enter the name of the machine to transfer to (e.g. dave) and enter the unique password for that machine. Passwords on the individual supercomputers will expire every 90 days.

2.4.2 Fileserver

The NFS mounted fileserver /fs not longer exists inside the firewall. A new fileserver /fis has been created for use inside the firewall. Please see the web site above for recent changes to this configuration.

2.4.3 <B>sftp,scp,ssh

Only the secure versions of <B>ftp, <B>cp and secure shell are allowed. All other commands have been disabled.